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  • 1
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    Evaluation of X-band MR surface and ADCP subsurface currents obtained onboard the German research vessel Polarstern during ANT-XXXI expedition 2015/16 (2017)
    In:  EPIC3OCEANS 17, ANCHORAGE, USA, 2017-09-18-2017-09-21
    Details
    Publikationsdatum: 2018-01-02
    Beschreibung: Limits of a comparative evaluation of the performance of a conventional X-band marine radar (MR) sigma S6 WaMoS® II used for surface current measurements are dicussed. Main focus of the paper is to address challenges when comparing current measurements from different measuring devices for evaluation purpose. Although the current measurement principles of MRs and acoustic Doppler current profilers (ADCPs) are disparate, they are often used to validate the quality of MR current measurements. In fact, differences in MR and ADCP derived currents can have a variety of physical reasons and do not necessarily indicate measurement errors. One possible cause of deviation is the comparison of dissimilar quantities.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Employment of upward-looking sonar for ice thickness measurements in the Weddell Sea (2006)
    In:  EPIC3International workshop on Antarctic sea ice thickness, Hobart, Tasmania, AustraliaJuly, 5, 2006 p.
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 3
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    Variations of Winter Water properties and sea ice along the Greenwich meridian on decadal time scales (2011)
    Elsevier
    In:  EPIC3Deep-Sea Research II., Elsevier, 58(25-26), pp. 2524-2532
    Details
    Publikationsdatum: 2019-07-16
    Beschreibung: Sea-ice ocean interaction processes are of significant influence on the water mass formation in the Weddell gyre. On the basis of data obtained between 1984 and 2008 from eight repeat hydrographic sections, moored instruments and profiling floats in the Weddell gyre on the Greenwich meridian – almost all of them collected with RV Polarstern – we identified variations in the properties of the Winter Water and the sea ice draft. In the Winter Water the salinity was relatively low throughout the 1990s (with a minimum in 1992) and a maximum was observed in 2003. Observations of sea ice draft by moored upward looking sonars are available from 1996 onwards. In the southern part of the transect they display variations on a decadal time scale with a minimum in sea-ice thickness in 1998 and an increase since then. Salinity variations in the Winter Water layer cannot be explained only by variations in sea-ice formation and variable entrainment of underlying Warm Deep Water, but lateral advection of water and sea ice needs to be taken into account as well. Potential sources are melt water from the ice shelves in the western Weddell Sea or transport of water of low salinity entering the Weddell gyre from the east. Accompanying variations of the properties of Warm Deep Water are discussed in detail in a companion paper (Fahrbach et al., 2011, this issue).
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
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    Thermodynamic sea ice growth in the central Weddell Sea, observed in upward-looking sonar data (2015)
    American Geophysical Union
    In:  EPIC3Journal of Geophysical Research: Oceans, American Geophysical Union, 120(3), pp. 2270-2286, ISSN: 21699275
    Details
    Publikationsdatum: 2018-01-01
    Beschreibung: Upward-looking sonar (ULS) data were used to analyze thermodynamic sea ice growth. The study was carried out for an ocean region in the central Weddell Sea, for which data of sea ice thickness variability and of the oceanic heat flux through the ice are rare. In the study area the contribution of sea ice deformation to vertical ice growth is relatively small in some years. This provides the opportunity to simulate thermodynamic sea ice growth considering the influence of a snow cover and of the oceanic heat flux. To this end, a modified version of Stefan’s law was used. The resulting ice thickness variations were then compared with the ULS measurements. For the investigated cases, the best consistency between data and model results was obtained assuming a snow layer of less than 5 cm thickness and average oceanic heat fluxes between 6 and 14 W m^-2. It is demonstrated that in conjunction with ice drift data and analytical models for thermal sea ice growth, ULS ice thickness measurements are useful for studying the seasonal cycle of growth and decay and for inferring the magnitude of the average oceanic heat flux under sea ice.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
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    AWI ULS Sea Ice Draft in the Weddell Sea, updates of figures 2 & 11 and table 5 (2012)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
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    Thermodynamic Growth of Sea Ice in the Weddell Sea (2014)
    In:  EPIC3European Geosciences Union General Assembly 2014, Vienna, Austria, 2014-04-27-2014-05-02
    Details
    Publikationsdatum: 2015-04-20
    Beschreibung: Thickness measurements of Southern Ocean sea ice are very sparse and satellite altimetry still provides relatively uncertain estimates of ice thickness. The only tool for monitoring sea ice thickness over long periods of time with sufficient accuracy are moored upward looking sonars (ULS). The instruments measure the subsurface portion (draft) of the ice by recording the travel times of sonar signals (Fig. 1). We present ULS data from the central Weddell Sea, where the sea ice starts forming in April and disappears in January of the following year (length of growth period: ~180 days). We use the data together with Stefan's Law to estimate the two quantities that limit the maximum thermodynamic ice growth in austral winter to about 1 m: (a) The snow cover on top of the ice and (b) the oceanic heat flux from below.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
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    Sea ice draft measured by upward looking sonars in the Weddell Sea (Antarctica)
    PANGAEA
    In:  Supplement to: Behrendt, Axel; Dierking, Wolfgang; Fahrbach, Eberhard; Witte, Hannelore (2013): Sea ice draft in the Weddell Sea, measured by upward looking sonars. Earth System Science Data, 5(1), 209-226, https://doi.org/10.5194/essd-5-209-2013
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: The presented database contains time-referenced sea ice draft values from upward looking sonar (ULS) measurements in the Weddell Sea, Antarctica. The sea ice draft data can be used to infer the thickness of the ice. They were collected during the period 1990-2008. In total, the database includes measurements from 13 locations in the Weddell Sea and was generated from more than 3.7 million measurements of sea ice draft. The files contain uncorrected raw drafts, corrected drafts and the basic parameters measured by the ULS. The measurement principle, the data processing procedure and the quality control are described in detail. To account for the unknown speed of sound in the water column above the ULS, two correction methods were applied to the draft data. The first method is based on defining a reference level from the identification of open water leads. The second method uses a model of sound speed in the oceanic mixed layer and is applied to ice draft in austral winter. Both methods are discussed and their accuracy is estimated. Finally, selected results of the processing are presented.
    Materialart: Dataset
    Format: application/zip, 38 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
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    (Table 1) Mean sea-ice properties from moored upward looking sonars along the Greenwich meridian (2011)
    PANGAEA
    In:  Supplement to: Behrendt, Axel; Fahrbach, Eberhard; Hoppema, Mario; Rohardt, Gerd; Boebel, Olaf; Klatt, Olaf; Wisotzki, Andreas; Witte, Hannelore (2011): Variations of Winter Water properties and sea ice along the Greenwich meridian on decadal time scales. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2524-2532, https://doi.org/10.1016/j.dsr2.2011.07.001
    Details
    Publikationsdatum: 2023-10-28
    Beschreibung: Sea-ice ocean interaction processes are of significant influence on the water mass formation in the Weddell gyre. On the basis of data obtained between 1984 and 2008 from eight repeat hydrographic sections, moored instruments and profiling floats in the Weddell gyre on the Greenwich meridian - almost all of them collected with R.V. Polarstern - we identified variations in the properties of the Winter Water and the sea ice draft. In the Winter Water the salinity was relatively low throughout the 1990s (with a minimum in 1992) and a maximum was observed in 2003. Observations of sea ice draft by moored upward looking sonars are available from 1996 onwards. In the southern part of the transect they display variations on a decadal time scale with a minimum in sea-ice thickness in 1998 and an increase since then. Salinity variations in the Winter Water layer cannot be explained only by variations in sea-ice formation and variable entrainment of underlying Warm Deep Water, but lateral advection of water and sea ice needs to be taken into account as well. Potential sources are melt water from the ice shelves in the western Weddell Sea or transport of water of low salinity entering the Weddell gyre from the east. Accompanying variations of the properties of Warm Deep Water are discussed in detail in a companion paper (Fahrbach et al., 2011, doi:10.1016/j.dsr2.2011.06.007).
    Schlagwort(e): AWI; AWI227; AWI229; AWI230; AWI231; AWI232; AWI233; Duration, number of days; Elevation of event; Event label; Latitude of event; Lazarev Sea; Longitude of event; Mooring (long time); MOORY; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Sea ice draft; South Atlantic Ocean; SPP1158
    Materialart: Dataset
    Format: text/tab-separated-values, 24 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 9
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    Raw data of continuous VM-ADCP (vessel-mounted Acoustic Doppler Current Profiler) profile during POLARSTERN cruise ANT-XXVIII/2 (2015)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publikationsdatum: 2024-06-25
    Schlagwort(e): Acoustic Doppler Current Profiling (ADCP), TRDI Ocean Surveyor, 153.6 kHz; ANT-XXVIII/2; AWI_PhyOce; CT; File content; File name; Physical Oceanography @ AWI; Polarstern; PS79; PS79/2-track; South Atlantic Ocean; Underway cruise track measurements; Uniform resource locator/link to raw data file
    Materialart: Dataset
    Format: text/tab-separated-values, 27 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 10
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    Raw data of continuous VM-ADCP (vessel-mounted Acoustic Doppler Current Profiler) profile during POLARSTERN cruise PS89 (ANT-XXX/2) (2015)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publikationsdatum: 2024-06-25
    Schlagwort(e): Acoustic Doppler Current Profiling (ADCP), TRDI Ocean Surveyor, 153.6 kHz; ANT-XXX/2; AWI_PhyOce; CT; File content; File name; File size; Physical Oceanography @ AWI; Polarstern; PS89; PS89-track; South Atlantic Ocean; Underway cruise track measurements; Uniform resource locator/link to raw data file
    Materialart: Dataset
    Format: text/tab-separated-values, 40 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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